The best proof of intelligent life in space is that it hasn't come here.

The difference between machines and human beings is that human beings can be reproduced by unskilled labour.

The only way to define your limits is by going beyond them.

Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

My objection to organized religion is the premature conclusion to ultimate truth that it represents.

A precondition for being a science fiction writer other than an interest in the future is that, an interest - at least an understanding of science, not necessarily a science degree but you must have a feeling for the science and its possibilities and its impossibilities, otherwise you're writing fantasy. Now, fantasy is also fine, but there is a distinction, although no one's ever been able to say just where the dividing lines come.

Our own grandchildren may demonstrate that-sometimes- Gigantic is Beautiful.